Apparatus for making pulp or the like



Feb. 16, 1937. H. D. MARTINDALE APPARATUS FOR MAKING PULP OR THE LIKE Filed 001;. 11, 1935 2 Sheets-Sheet 1 gn uc wCo L Nm mm \N a P by, M.

Feb.'16, 1937. .5, D M DAL' 2,070,742

APPARATUS FOR MAKING PULP OR THE LIKE Filed Oct. 11, 1935 2 Sheets-Sheet 2 Ja/v/r Favor/H? Patented Feb. 16, v 1937 UNITED STATES PATENT OFFICE Homer D. Martindale, Middletown, Ohio, assignor to The Black-Clawson Company, Hamilto Ohio, a corporation of Ohio Application October 11, 1935, Serial No. 44,595

4 Claims.

This invention relates to paper pulp apparatus.

One object of the invention is the provision of means for eificiently removing an unusually large proportion of trash or impurities from paper pulp stock.

Another object of the invention is the provision of apparatus adapted to continuously collect impurities that settle in a-settling trough and moving such impurities from opposite directions towards a transverse channel, from which the impurities are carried away in a continuous manner.

Other objects and advantages of the invention will be apparent from the following description. the appended claims and the accompanying drawings, in which Fig. 1 is a top plan view of a pulping apparatus embodying the present invention; and

Fig. 2 is an end view of the pulping apparatus, with the trash remover shown in vertical section.

Referring more particularly to the drawings by reference numerals, the invention is shown as applied to a pulping apparatus including a breaker beater Ill, to which the material to be pulped or defibered is supplied, the breaker beater having a beater roll I l of any suitable type, provided with spaced blades or knives. A motor l2 supplies the necessary power for rotating the beater roll.

The breaker beater is preferably equipped with a rag catcher as indicated at l3 and a junk re-' mover as indicated at I4. A junk remover of the character disclosed in Martindale Patent 1,680,912 dated August 14, 1928 may be used for the removal of foreign materials separated by gravity from the stock in the process of reduction in the beater. the breaker beater is reduced sufficiently, it passes through the perforated backfall screen and into the regulating box IE. Pumping unit l6 pumps the stock from the regulating box to the supply end of a settling trough 20.

The trough 20 is quite long, its floor extending preferably horizontally from the supply end to the delivery end. The width of the bottom and the height of the vertical side walls may be several feet, depending upon the capacity required. After the stock leaves the output end of the settling troughit passes through screens 2|, the screenings then being supplied to thickeners 22, and from the thickeners the stock goes to any suitable stock chest, not shown.

The junk remover l4 takes heavy metal pieces, scraps of iron, gravel, some sand, etc., out of the breaker beater, but the stock passing through the holes in the backfall and supplied to the As the material supplied to settling trough still contains some comparatively small sized pieces that are sufficiently heavier than water to settle out if there is sufiicient set- I tling time. The trough may include baflles which collect the heavier impurities. After the usual type of settling trough has been operating for some time it is necessary to shut down the system and clean out the trough so as to remove the heavier particles settled from the paper pulp stock. In accordance with the present invention, however, the construction is such that the heavier or settled impurities that settle out in the trough are continuously removed during operation, so that the apparatus can operate for long periods of time without shut-down.

Located a considerable distance from either end of the settling trough 20, the latter is provided with a deepened and widened portion, providing a transverse channel 23 into which the impurities that settle in the trough are moved and from which the impurities are carried away by means of a continuous carrier device which will be later described. The settling and settled impurities in the trough are collected and held back from the main flow of stock by means of movable blades, which are preferably of comparatively small height, so as to project only part way up to the top surface of the stock in the settling trough. The blades which are provided ahead channel 23 are arranged in a continuous series, being carried by carrying belts or chains 24 which are driven by pulleys 25 and which pass over guide pulleys 26. These blades move in the direction of travel of the stock, but at a very slow rate of speed as compared to'the speed of stock flow along the trough. The blades, which have been given reference numeral 21, scrape along the floor of the trough and are of substantially the same width as the width of the trough, so that any impurities which settle below the upper edges of the blades will be accumulated by the blades and slowly carried toward the channel 23, into which they fall. The main portion of stock passes in a continuous stream over the tops of the blades.

A second series 28 of the blades 21 is provided beyond channel 23, the blades of this second system traveling in a reverse direction to the first series,-that is, the blades of the series 28 which move in the stock, travel toward the left as viewed in Fig. 1, while the returning blades of the series 28 travel toward the right above the top surface of the stock. A motor 29, operating through suitable reduction gearing which is diagrammatically shown in Fig. 1 and indicated by of the.

reference numeral 30, is arranged in driving connection with both of the blade series, which preferably operate at the same slow rate of speed which is sufliciently slow to avoid agitation of the settling stock by eddy currents.

With the first series of blades traveling in the same direction as that in which the stock moves it will be apparent that any particular portion of stock in moving from the supply end to the channel 23 travels over fewer blades 21 than a portion of stock traveling in the same direction but beyond the channel 23. However, the heavier impurities settle first, and comparatively rapidly, in the first portion of the trough, while the second series 28 is quite effective by reason of the movement of its blades in a. direction opposite to the stock flow, thus providing for effective separation of smaller impurities and impurities which are only slightly heavier than water. It will also be noted that in accordance with the drawings, the blade series can terminate some distance ahead of the end of the settling trough, so that the end portion 3| of the settling trough can function to take out only those impurities which settle only with extreme difiiculty, but as there are comparatively few impurities of this particular kind this portion 3| of the settling trough need not be frequently cleaned.

The action of the blades 21 scraping along the bottom of the trough and moving toward the channel 23 from both sides of the channel guides the settled impurities, mixed with settled paper pulp stock, into the channel, and from here the impurities are continuously taken away by a conveying device including a. series of conveyor buckets. The channel 23 is preferably substantially U-shaped in cross section as shown in Fig. 2, and extends across the bottom and up along the outside of both sides of the trough 20. The conveyor system. which operates within the channel 23 comprises a chain 32 which is driven by sprocket 33 which in turn is driven through suitable reduction gearing by the motor 34. The conveyor system moves in the direction indicated by the arrow in Fig. 2, passing over idler sprocket 36 and then carrying the buckets down into the channel. Within the channel there are no guides, and suflicient slack is left in the chain so that the buckets 3! follow the contour of the bottom of the channel 23 and pick up the trash and collected impurities that are there. They then, of course, elevate the trash and impurities and dump them into the hopper 38, from which they are carried away through pipe 39.

The conveyor system justmentioned is called upon to handle only a comparatively small amount of material, since the breaker beater and its associated cleaning devices clean the stock of the greater portion of the larger and heavier impurities present. Consequently the buckets of the trash remover in the settling trough are made quite small, and the channel itself is of comparatively small total capacity so that a large amount of good pulp stock will not be lost. Furthermore,

due to the small size of the buckets the amount of the good stock carried away by the buckets is also quite small, and the pipe 33 can be merely a waste outlet although if it is thought desirable to salvage the good stock picked up by the buckets the pipe 39 can be used to supply the stock to a suitable separating device, or can return the stock back to the junk remover I4.

It will now be apparent that the settled impurities that come down while the stock is moving through the settling trough are collected and carried away so that the stock passing to the screens 2! is in very clean condition. with the removal of the settled impurities taking place at a point between the ends of the impurity collecting portions of the trough it will be apparent that a rapid settling of the heavier impurities. can take place promptly after the stock is supplied to the trough, and if there should be any disturbance created in the channel 23 by the operation of the buckets therethrough, impurities thus stirredup and passing along through the trough will be again settled out and collected and returned back to the trough.

While the form of apparatus herein described constitutes a preferred embodiment of the invention, it is to be understood that the invention is not limited to this precise form of apparatus, and that changes may be made therein without departing from the scope of the invention which is defined in the appended claims.

What is claimed is: I

1. In pulp purifying apparatus, a settlin trough having a portion for receiving settled impurities, means moving in said trough for carrying settled impurities in the direction of stock flow into said portion, additional means moving in said trough in opposition to the direction of stock flow for moving settled impurities into said portion.

2. In pulp purifying apparatus, a settling trough having a transverse channel located between the ends of said trough for receiving settled impurities, and means within the trough on both sides of said channel for moving settled. impurities from the trough into the channel.

3. In pulp purifying apparatus, a settling trough having a transverse channel for'receiving collected impurities, and means for collecting impurities and moving the same into said chan nel comprising a series of shallow blades arranged with their tops well below the surface of the stock in the channel, and means for moving said blades longitudinally of the trough and in the direction of stock flow through the trough.

4. In pulp purifying apparatus, a settling trough having a deepened transversely extending channel portion at a substantial distance from the supply end of the trough for receiving settled impurities, and scraper means within the trough movable toward said portion and on both sides of said portion for moving settled impurities from the trough into said portion, and a series of carrier elements for removing the collected impurities from said portion,

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